The amphipod genus Anisogammarus (Gammaroidea: Anisogammaridae) on the Pacific coast of North America

19 Pages·2001·10.2 MB·English

by  E L Bousfield

AMPHIPACIFICA VOL. 3 NO. 1. MAY 16, 2001 29
The Amphipod genusAnisogammams (Gammaroidea: Anisogammaridae) on the Pacific coast
ofNorth America.
E. L. Bousfield, Research Associate
Royal Ontario Museum, Toronto, ON, Canada MSS 2C6.
ABSTRACT
ThegenusAnisogammarusDerzhavin(sens,lat.)(Amphipoda:Gammaroidea:Anisogammaridae)
isrepresentedintheeasternNorthPacificcoastal marineregionbyA.pugettensispugettensis(Dana),A.
slatteryi,n.sp.,A.epistomus,n.sp.,and A.amchitkana,n.sp. Anisogammarustvetkovae,newspecies,
occurs inthe northwestern SeaofJapanand Okhotsk Sea, along with the western Pacific subspecies A.
pugettensisdybovskyiDerzhavin. Anisogammaridsarefree-livingomnivores,occurringinthe shallow
sublittoralofcold-water,highsalinitycoastlines. Thelargecoxal gills ,eachbearingaccessorygills,are
presumablyadvantageousfor survival in partlyanoxic habitats where theycommonly occur.
Introduction Thepresentstudyattempts toprovidea morecom-
Thefirstanisogammarid species wasdescribedun- plete analysis of the systematics and distributional
der the name Gammarus pugettensis by J. D. Dana ecology ofNorth American Pacific species ofAniso-
(1853) from material collected in Puget Soundbythe gammarus.
U.S.ExploringExpedition. Commonregionalamphi-
podsdescribedbyStimpson (1857)containedthe sole Acknowledgments
anisogammarid, Gammarus confervicolus Stebbing Forassistance withfield workthe authoris greatly
.
(1906) summarized records of four Pacific aniso- indebted to regional marine laboratories, notably he
gammarid species under various names within PacificBiological Station,Nanaimo,B.C.,thePacific
Gammarus(sens, lat.), mostlywithinfamilyGammar- Environmental Institute, West Vancouver, B. C., the
idae(sens.lat.). However,Stebbing(loc.cit.)assigned BamfieldMarineStation,B.C.,andtheFridayHarbor
Dana's"Gammaruspugettensis",a\so\htedbyHolmes Laboratories, WA. Much of the detail has been
(1904), to genusLiljeborgia. acknowedgedinpreviousstationlists(Bousfield 1958,
& &
During thefirsthalfofthe 20thcentury,fewaniso- 1963, 1968; Bousfield Jarrett 1981; Bousfield
gammarids were recorded from the North American McAllister 1962). Dr. Craig P. Staude, Dr. Colin B.
Pacific coast. Barnard (1954) more fully illustrated Levings, thelateDr.JosephineF. L. Hart,andthelate
Dana’sAnisogammaruspugettensisbasedonextensive Dr. Dan B. Quayle were especially helpful with the
collections from Oregon, and Shoemaker (1955) de- field collecting. Drs. Peter Slattery and Charles E.
scribedA.macginitieifromPt.Barrow Alaska. Exten- O'Clair provided valuable study material from the
,
sive amphipod material from British Columbia and Bering Sea and Aleutian Islands regions. Dr. Nina
adjacentregionswascollectedbyNationalMuseumof Tzvetkova, Zoological Museum, St. Petersburg, pro-
Canada marine biological expeditions during 1955- vided helpful commentary and loanofvaluable west-
1980 (see below). Mainly from this material, the ernNorthPacificmaterial. Dr.ChangBaeKim,Seoul
author (1979, 1981) described and illustrated a num- NationalUniversity,kindlyprovidedcommentaryand
berofnewanisogammaridgeneraandspecies. Aniso- figures on new materialfrom South Korea,
gammarusmacginitieiwasalsotransferredtothe new The original taxonomic work was performed as a
genusBarrowgammarus whereisusedasanoutgroup staffmemberofthe National MuseumofNatural Sci-
in later analysis (p. 45). Some of these, and earlier encesattheHoilyLaneLaboratory,Ottawa,ON, 1979-
records, are embodied in the general faunistic guides 1983. Originallineillustrationswerepreparedwiththe
and catalogues ofRicketts & Calvin (1968), Barnard capable assistance ofartist Roy E. Zittin, Cupertino,
(1975), Austin (1985), and Staude (1987). CA.
Gurjanova(1951) summarizedearly workonwest- The author is grateful to staffofthe Canadian Mu-
ern Pacific anisogammarids, updated by the compre- seumof Nature,especiallyto EdHendrycksforassist-
hensivestudyofTzvetkova(1975)andtheworld-wide anceinpreparationofsiidemountsandcommentaryon
compilation of Barnard & Barnard (1983). Ishimaru Anisogammarus epistomus, and to collections mana-
(1994) summarizedearlierrecords fromJapan. gerJudith Priceforhelpin cataloguingand labeling.
i :
AMPHIPACIFICA VOL.3 NO. 1. MAY 16, 2001 30
SYSTEMATICS
Ailometric growth changes are often noticeable.
Compared with the adult stage, juveniles tend to be
Anisogammaridae Bousfield armedwithfewerbutrelativelylargespinesanddorsal
toothofurosome2,andtheinnerramusofuropod3 is
Anisogammaridae Bousfield 1977: 295;—Bousfield relatively short.
1979:307(+keytogenera);—1981:72-76,figs. 1-4;—
:259;—1983:267;—Barnard&Karaman1991: 114;— AnisogammarusDerzhavin
Ishimaru 1994: 46;—Bousfield & Shih 1994: 129.
&
Anisogammarids:Barnard Barnard 1983:582(+key AnwogammarwsDerzhavin,1927:8;—Gurjanova1951
to genera). 776;—Tzvetkova 1975: 94(part,+ keytospecies);—
Gammaridae(part): Stebbing 1906: 364;—Gurjanova Barnard & Barnard 1983: 584;—Ishimaru 1994: 46.
1951: 760;—Barnard, 1969 (part): 242;—Tzvetkova
1975(part): 30. Typespecies: GammaruspugettensisDana, 1853
Type Genus: AnisogammarusDerzhavin, 1927: 8. Species: Anisogammaruspugettensis dybovskyi Der-
zhavin, 1927;A.slattery n. sp.(p.34);A.epistomusn.
Genera: Barrowgammarus Bousfield, 1979: 321; sp.(p.36);A.amchitkana,n.sp. (p.39);A.tzvetkovae,
Eogammarus Birstein, 1933: 149; Spinulogammarus n. sp. (p. 41).
Tzvetkova, 1972: 954; Spasskogammarus Bousfield,
1979: 332; Locustogammarus Bousfield, 1979: 322; Diagnosis: Anterior head lobe acute above, rounded
Jesogammarus Bousfield, 1979: 335; Ramello- below, with shallow lateral notch. Eye medium,
gammarus Bousfield, 1979: 337; Carineogammarus reniform. Antenna 1 shorterthan 2; accessoryflagel-
Bousfield, 1979: 343. lum well developed. Antenna 2, peduncle stout, seg-
ment5shorterthan4,oftenwithclustersoffinespines
Diagnosis:Head,rostrumveryshort;inferiorantennal withextended tips (male);flagellum lacking calceoli
sinus large, occasionally with narrow posteriornotch. (male).
Antennae medium, subequal, accessory flagellum Mouthparts basic, with few modifications. Lower
prominent, Antenna2,pedunclelarge,flagellumocca- lip, inner lobes incompletely developed. Mandible:
sionallycalceolate. left lacinia 5-dentate; palp slender, terminal segment
Mouthparts regular, little modified. Lower lip, withwelldeveloped"D"spinesand"E"setae,butonly
5i-ndneenrtlaotbee;ssvpairnieo-ursloywdsetvreolnog.ped. Mandible:leftlacinia 2o-nseecglmuesntetreodf."AM"axseitlalea(2o,fCinonleer1p9l8a0t)e.wiMtahxiflulllar1o,pwalopf
Peraeondorsallysmooth. Coxalplates 1-4medium oblique facial setae. Maxilliped, inner plate with 3
&
deep, regular; plates 5 6 shallowly anterolobate. apical spine teeth; palp setose, not raptorial.
Gnathopods powerfully subchelate (male); gnatho- Coxae 1-4 medium deep, smooth, rounded below;
pod 1 largerthan2;palmarmarginsbearingpegspines coxae5&6weaklyanterolobate. Gnathopod (male)
1
(male),simpleorpectinate(female);carpusshort,lobe largerthan 2butusuallysimilarinform;in thefemale
small. Peraeopods 5-7, bases weakly heterpodous; itismuchlargerandofdifferentformthangnathopod
dactylsshort. Peraeopods2-7withlargecoxalgills, 2- 2;carpus short;propodal palm(male) withpeg-spines
5with 2, P6 with 3, andP7with 1-2accessory gills. variously developed. Peraeopods 3 and 4, segment 5
Pleosome and urosome variouslydorsallycarinate, short,dactylsshort. Peraeopods5-7,basesbroadened
&
toothed,spinose,orsmooth. Uropods 1 2,rami usu- proximally, weakly heteropodous; segment 5 longer
ally short, linear, spinose. Uropod 3 large, sub- than4; peraeopod7notlongerthan6. Coxal gillson
aequiramous,terminalsegmentsmall. Telsonbilobate, peraeopods2-5and7each with2andon peraeopod6
with marginal andapical spines. Female broodplates with3, linearaccessorygills. Female broodlamellae
large, unequal, with numerous long marginal setae. broad, withnumerous long simple marginal setae.
Pleosome smooth above, lacking spines or setae;
Remarks: During amplexus, males position them- Epimeral plate 3, hind comer quadrate or slightly
selves dorsallyand graspthe anteriormarginofcoxal produced. Pleopodsregular,outerramus basallywith
plate 4,typicallybymean&sof thedactylandpropodof split-tipped“clothespin”spines. Urosome 1 withmid-
gnathopod 1 (Bousfield Shih 1994). dorsal hump and 3 groups of spines; uropod 2 with
AMPHIPACIFICA VOL. 3 NO. 1. MAY 16, 2001 31
KEY TOSPECIES OFANISOGAMMARUSANDBARROWGAMMARUS
1. Antenna 1 and 2subequal in length; peraeopods 5-7, bases sublinear, notbroadened posteriorly;
& &
urosome segments 1 2 lackingdorso-lateral spines orteeth; uropods 1 2, rami lanceolate,
unarmed Barrowgammarus macginitiei (p. 44)
Antenna 1 distinctly shorterthanantenna2; peraeopods 5-7, bases broadenedproximo-poster-
&
iorly; urosome segment 1 with dorsolateral spines; uropods 1 2, rami linear, with marginal
andapical spines 2.
2. Gnathopod2 (c?) small, weakly subchelate, as in9; uropod3 (cP,9), rami with marginal spines,
lacking setae; telson short, length not greaterthanwidth A. amchitkana(p.39)
Gnathopod2(d1) large, subsimilartognathopod 1; uropod3, marginsoframi with spines and
setae; telsonnormal, length distinctlylongerthan basal width 3.
&
3. Gnathopods 1 2(cf), propodal palmar margins with heavybluntpeg spines; mandibular palp
elongate; peraeopod4, segment4elongate ~2X segment5 A. tzvetkovae (p.41)
Gnathopods (<$ ), spines ofpalmarmargins regularpeg spines, tips not broadened ; mandibular
palpnormal; peraeopod4, lengthofsegment4~ 1.5X segment5 4.
4. Antenna 1, peduncular segment2 short, length<1/2 segment 1; epimeral plate 3, hind comer
squaredor slightlyacuminate; urosome 1 with 1-2weakdorsolateral spines; mandibularpalp
segment3 short, “D” spines enlargingdistally 5.
Antenna 1, peduncular segment2normal, length>1/2 segment 1; epimeral plate 3, hindcomer
acute, produced; urosome segment 1 with 3-4medium strongdorsolateral spines; mandibular
palp segment3 regular, “D” spinesofuniform size throughout 6.
5. Coxae 1-3, lowermargin richly armed with longish setae; uropod 3 innerramus markedly shorter
than (2/3 lengthof) outerramus; telson. distal marginal clusterwith one verylarge,elongate
spine (>2X length ofother spine) A. slatteryi (p. 34)
Coxae 1-3, lowermargin weaklyarmed with short tomedium setae; uropod3, innerramus large,
length>3/4outerramus; telson, distal marginal clusterofspines notmarkedly unequal in size,
(longest<2X otherspines) A. epistomus (p. 36)
6. Antenna 1 (c?), peduncular segment5with scatteredclusters ofslender, tip-extended spines; uro-
pod3,outerramus broad nearly straight A.pugettensispugettensis (p. 31)
Antenna 1 (cf), peduncularsegment5with clusters of slender spines indistinct rows; uropod3,
outerramus slender, medio-distally curved A.pugettensisdybovskyi (p. 34)
acute mid-dorsal tooth, and weakpostero-lateral cusp Anisogammaru$?ugettensisGur}anova.1951(part):777,
& —
on each side. Uropods 1 2 short, stout. Uropod 3 fig. 541;—Barnard 1954: 13, pis. 12-14; Tzvetkova
—
subequallybiramous,marginsspinoseand/orplumose- 1975(part):98,fig.35; Bousfield1979:310(key);-
setose;outerramuswithshortterminalsegment. Lobes Bousfield 1982: 72,fig. 1;—Barnard & Barnard 1983
— —
oftelson each with twogroups of lateral spines. (part):584,fig.38; Austin1985:607; Staude 1987:
383.
Distribution:PanborealNorthPacific,inalgae,mainly
on sedimentarybottoms, low intertidal to~30m. Material Examined: Morethan600specimens in99
100lots.
Anisogammaruspugettensispugettensis (Dana) ALASKA.
(Fig. 1 ) SEAlaska,ELB Stns., 1961 (seeBousfield&McAllister,
1962):
Gammarus pugettensis Dana,1853: 957, fig. 1;— A5,TongassNarrows,nearKetchikan-Cf (17mm);lot#2
Holmes 1904; 239. -9ov(11.5mm),fig’dspecimens,CMNC 1980-0053;A7,
;
AMPHIPACIFICA VOL.3 NO. 1. MAY 16, 2001 32
BostwickBay,June2/61-9(br.II)(14.5mm),slidemounts, 1977:
CMNC 1980-0084; Lot#2 - 2 $$); Lot#3 (18cfcT);lot B2 799,5im);B7a.WillisBeach,OakPt„Viet-
#4-599ov,CMNC1980-0087;CMNC1980-0092;CMNC oria. May 19 - 18 cfd\ 30 99 subad (16 mm), slide
^980-0094;All (100&<3&99ov, small im);Lot#2( 9, mount,CMNC1980-0029;CMNC1980-0038;CMNC
lim);Lot#3 (<$, im);A12(22c?d\3399 ov,5im),Lot#2 1980-0039; E2 (2 99 ov).
- l9ov);A18(lim);A16(lim);A20 (Id*, l9ov, 2im);
A#22-51(29,992iomv));;AAl3l0((140099larogve,<4$i&m)(;toA1353.5(5mm9)9;ovA,l3lj(uLvo)t; Misc. CMNcollections:
A34(5d'C?,499 ov, 5im);A37(ld*);A43(l9ov), Lot LadysmithHbr.,VancouverI.,B.C.,D.B.Quaylecoll.,
#2- 12d*cf, 1599,20im;#3- 14d’d\3399ov, 15im);A48 June8/38-27d’d', 99 ov(brokenspecimens);Satuma
(199ov);A54(ljuv);A55(l cf, 19,Lot#2 - 12im);A65 I., BruceBight,B. C.,J.F.L. Carlcoll.,Aug. 26/55-2
(Id1);A67(19, 14juv);A71 (12C?C?,2099, 14im;lot#2 99ov; Ibid., nightlightoverkelp, Aug24/55- 1 d\ 1
-30im);A73(12d’d’,999ov, 5im);Lot#2(8d'd\ 1499, 9, 2juv;
2im);A81 (10C?C?,799ov, 30im);A83(3tfc?, 10 99ov, Porpoise Hbr,B. C., 20m, M. Waldichukcoll.. Sept.
17juv);A84(60tfc?,99ov large);A86(Icf);A88(3cfd\ 24/64-3 99;Ibid., Sept. 18/62-3 cfcf, 799ov, 1 im,
1299,2im);A93 (24im);A136(1 d\ 13im);A139(3CfC? NMNSCat.No.6-90;NassHbr.,IcebergBay,ondead
599, 5im);A140(9d’d', 1599, 30im&juv); lot#2(1 fish intrap, S. Gorhamcoll., June 20/65 - 7c?d\499
9,3 im); A141 (lcf);A153 (1 im);A 171 (2juv);A174(l ov., 2 im
Ed\LsBmaSltln)s;.,L1o9t8#02(s(e2e5Baoduusltf,ie1l7dj&uv)J.arrett 1981): Off Cordovma, Orca Inlet, Prince William Sound, SE
Alaska, 13 dredge,K. E. Conlan, Feb. 18/89- d\9
S14L1 (3 imm).
matingpair.
BRITISHCOLUMBIA:
WASH.-ORE, USA.
QueenCharlotteIslands,ELBStns., 1957(seeBousfield
ELB Stns., 1955(see Bousfield, 1958):
1963):
H5(6cfd\899, 12im); N4(2juv). FE8L,BGaSrtrniss.,on1B9a6y6,(SseaenBJouuasnfiIe.,ld9&Jarr6et9t,9,19481i)m:.
North Central Coast, ELB Stns., 1964 (see Bousfield W3 (1 d\ 1 9, 10im);W4(l im);W5(ljuv);W7,Meadow
Point,PugetSound,July17. - d* (14.0mm); 9ov.(llmm),
(HPH1e4915a6c7r8(fl)1(d:H1\jau9r1v,b0);o19u2H9ri1,,m3)n1;r3(.H1jPIu9rv8i)on;(vc1,Lejo3uRt5vu)#pi;e2mrH)t(3;,89Hisim1(l)16t.yju(sv2a)cn;?ddH,\5e3e0l9(g92r,iasms1),2;LHimW5),6; 7(Wsl119iid90me,)m(;3o4W5udn*3ictm3rs),,;(7dCW9\M4914oN0vC(i,3m)51i;i9mm8)W);03;-W90W60l(696l5;j(u(91vI)boj;ivud)vI..)h.;iLsWoLt(1L#8o(2t1-#j22uv0-);3sWpdm2’sd2;1,
E
D. McAllister,June23/65- ld\
Diagnosis Male(16mm): Anteriorheadlobeslightly
NorthernVancouver Island,ELBStns., 1959(seeBous- incised. Eye medium, sub-reniform. Antenna 1,
field 1963): peduncularsegment2medium,length 1/2peduncle 1
V17(7d>cf, 1099ov, 11 im);V18(1 d1,3im);V22(75 flagellum~20-segmented,littleexceedingpeduncleof
spms., mostly large 99 ov); lot #2(1 d\ gnathopods antenna2. Antenna 2,peduncularsegment5=4,with
dissected); N18 (lc?,499, 17juv). few clusters oftip-extended slender spines;flagellum
17-segmented, shorterthan peduncle.
Southern Vancouver island,ELB Stns. Mandibular spine row with 8-9 blades; palp rela-
1955 (see Bousfield 1958): tively short; segment 3 > 2/3 segment 2, "D" spines
F3(1 im);F4(9ov, 13im);F6(1 d\4399,5im,dried);M2 uniform, extending 2/3 of inner margin; segment 2,
((15iimm);&Mj2uv)(;1 GCf1,21 (989)i;mM&5j(uv2)9;iGm1&5j(u1vd);\G349(93,j2uvi)m;).G10 bbertoaadaenndignagmdmisataslelyt.aevMeaxriylslhiopret.d, Miannxeirllpala1t,epaalppiclaitltllye
& truncate, outer plate little broadened; palp segment 3
1970(forStns. of 1970-80, see Bousfield Jarrett 1981):
P717(sev. im). regular, length> 1/2 segment 2.
&
1975: Gnathopods 1 2 stout, dactyls with short unguis;
Friiday Harbor, May/75-2CfC?(20mm). Gnathopod 1, palmarangle with 8-10 innerandouter
1976: rowsofsimplespines. Gnathopod2,propodalpostero-
Pacific Environmental Institute, West Vancouver, in distal angle with inner submarginal row of 6 short
&
halibuttank, June8 - Id1 (18mm). simplespines. Peraeopods3 4,segment6relatively
AMPHIPACIFICA VOL.3 NO. 1. MAY 16, 2001 33
Fig. 1. Anisogammaruspugettensispugettensis (Dana), c? (17mm); Q ov. (11.5 mm).
Tongass Narrows, SE alaska.
.
AMPHIPACIFICA VOL. 3 NO. 1. MAY 16, 2001 34
short,arched,littlelongerthan segment5. Peraeopod 1933-cf (13 mm),slidemount;2cfcf (13 mm); 9°v. (11
7,basiswithslightpostero-distalmarginalexcavation. mm), slide mount (identified as A. pribilofensis by E.F.
Coxal gill on peraeopod7relativelylarge, broad. Gurjanova, 1933), Zoological Museum cotins., St. Peters-
burg, Russia.
Epimeralplates2and3,hindcomeracute,distinctly
Alaska-BeringSeaP.Slatterycoll:
produced. Urosome 1,mid-dorsalhumpmedium,with MukmukBay,St.LawrenceI.,40ft.scoop,July 1/83-399
clusterof8-10medium spines; lateral clusters with3- ov,3juv, IZ 1989-002.
4 spines. Urosome 2 with strong median tooth and NESt. LawrenceI.,July/83 - 1 Cf (18.5mm).
single postero-dorsal cusp on each side. Urosome 3 UnimakI,P. Slattery,June-Oct/82-2 cfCf ,599-
with mid-dorsal and dorsolateral clusters of 2-3 me-
&
diumspines. Uropods 1 2,rami shorterthanpedun- Diagnosis:Male(16mm). VerysimilartoAnisogam-
cles, margins moderately spinose. Uropod 3, outer marusp.pugettensis(Dana, 1853) butdiffering inthe
ramus medium broad, inner margin plumose-setose, followingfeatures:
slightlybutdistinctlylongerthanslenderinnerramus; Eye large,reniform. Antenna2(male),peduncle5
terminal segment short. subequal to 4, with numerous groups oftip-extended
Telsonlobesmedium,eachsidewithproximolateral slenderspines. Mandibularpalp, segment3withfew-
groupofthreespines,anddistolaterallongishmarginal er "A" and "E" setae. Coxa 1 more strongly setose
spine. below. Gnathop;od 1,propodal palmarspines shorter
Female ov. (14mm). Gnathopod 1,propodrelatively ?ind thicker, apex more blunt ; carpus, posterior lobe
large, subquadrate, posterodistal angle withgroups of narrow,subacute. Peraeopod7,posterodistalmarginal
3 inner, and 5-6 outer submarginal simple spines. excavationlinedwithfinesetae;segment6withafew
Gnathopod 2, propod subrectangular, postero-distal clusters oflongish setae, rather than clusters of short
anglewithsubmarginalrowof1 simpleand4pectinate spines. Epimeralplates2&3,hindcornerlessstrongly
spines; brood plate large, broad, with numerous mar- produced. Coxalgill7smallandshortrelativetocoxal
ginal setae. Uropod3,rami shorterthaninmale,inner gillofperaeopod6. Uropod3,outerramusrelatively
margin plumose-setose. narrow, length 4X width, curved distomedially. Tel-
son lobes each with pairofdistolateral short spines.
Distributional Ecology: Aleutian Islands and S. E.
Alaska, through B. C. and Washington state south to DistributionalEcology: WesternPacificcoastalma-
CoosBay,Oregon,andNorthernCalifornia,lowinter- rinewaters,northernJapanSeaandSeaofOkhotskto
tidal to subtidal, in Ulva and Enteromorpha, and in werstemBeringSea mostlyalongopencoasts,onsandy
,
partially anoxic bottom deposits of wood chips and silty substrata, from lower intertidal to depths of
(Waldichuk& Bousfield 1962). 280 m (Tzvetova, 1975); waters around Japan (Ishi-
maru, 1994); animals scavenge drowned dead human
Remarks: A very similar form has been recorded bodies (Koseketal 1962).
underthisnamefromthenorthernSeaofJapanandSea
ofOkhotskbyGurjanova(1951)andTzvetkova(1975) Remarks: Thisspecieshasbeensynonymizedwith A.
pugettensis originallydescribed from the eastern Pa-
,
Anisogammaruspugettensis (Dana), cificbyDana, 1853. However, sufficientdifferences
subsp. dybovskyiDerzhavin exist (above, and key) as todistinguish the twoforms
(fig. 2) at subspecies level.
Anisogammarusdybovsky Derzhav—in, 1927: 8 ;— Anisogammarus slotteryi, n. sp.
Stephensen 1944: 47, figs. 10. 11; Ishimuru 1994 (fig. 3)
(part): 46.
Gammaruspribiloffensis Pearse, 1913: 571, fig. 1. Anisogammarus sp. 1, Austin, 1985: 607.
Anisogammarus pugettensis Gurjanova 1951 (part):
777,fig. 541;—Tzvetkova 1975 (part): 99, fig. 35;- Material Examined:
Ishimaru 1994(part): 46. ALASKA:
St.LawrenceI.,BeringSea,6m sand,P.Slatterycoll.,June
MaterialExamined: 6/87-7juv(2-4mm)C;MIbNid-, lot#2-7juv(2-4mm).Ibid.,Lot
3 lots from East Kamchatka, USSR, K.Vinogradov coll., #3. -40juveniles, collections.
AMPHIPACIFICA VOL.3 NO. 1. MAY 16, 2001 35
Fig. 2.AnisogammaruspugettensisdybovskyiDerzhavin. <? (16 mm),Japan Sea; 9ov 14mm).
(
Kurile Islands, OkhotskSea. [ModifiedfromTzvetkova 1975
( )].
,
AMPHIPACIFICA VOL. 3 NO. 1. MAY 16, 2001 36
BRITISHCOLUMBIA; Telson lobes short, each side with proximolateral
NW
ELB Stn. H13,LuluI., end,July 14/64 - 9subadult, groupofthreespines,anddistolateral pairof unequal
CMN
br. I (3.5mm), coll'ns. spines.
m
PachenaBay, VancouverI.,whalepitNo. 1, 13 sand, P. Female ov. (6.5 mm). Antenna 2, flagellum 10-seg-
Slatterycoll.,April 13, 1983-d* (8.0mm),Holotype,(slide mented. Gnathopod 1 medium large, subquadrate,
mmoouunntt)),,CCMMNNCC22000011--00001132;; 9Cfo(v8..(06m.5mm)m,)P.arAaltlyotpyep,eC,M(sNliCde spinationofposterodistalanglesimilartothatofmale.
2-00119-0(051m4m4);,IbNiMd.NJ.SKeCnadta.lNlo&. P1.21S5la5t5t.erycoll.,Apr. 15/82 dGinsatatlhaonpgolde2w,itphroipnondershsourbtm,arsugbirneacltarnogwulaorf,3psoismteprloe-,
outerrowof4-5 pectinate spines. Broodplate large,
WASH.-ORE., ELB Stns., 1966; broad, but with relatively few (<30) marginal setae.
W46,LeadbetterPoint,opensandybeach,LW,Aug.4,1966 Uropod3,rami shorterthaninmale,margins spinose
CMN
-Id* subadult(4.5mm), coll'ns. with afew simple setae.
Diagnosis. Male(8.0mm) Anteriorheadlobe,frontal Etymology; The name recognizes marine biologist
:
margin straight. Eye medium large, subreniform. Dr. Peter F. Slattery, who has contributed broadly to
Antenna1,peduncularsegment2veryshort,length~1/ knowledge ofmarine benthiccommunities on the Pa-
3 peduncle 1;flagellum ~14-segmented, little exceed- cific coastofNorthAmerica.
ing peduncle of antenna 2. Antenna 2, peduncular
segment5shorterthan4,withscatteredclustersoftip- Distribution: BeringSeasouththroughVancouverI.
extended slender spines;flagellum 10-12-segmented, toWashington State, LW and subtidally, todepths of
shorter thanpeduncle. ~13 m, on sandand infeedingpits ofthe graywhale,
Mandibularspinerowwith5blades;palprelatively Eschrichtiusrobustus.
short, segment 3 > 2/3 segment 2; segment 3, "D"
spines in short row, increasing in length distally. Remarks: ThespeciesisverysimilartoA.epistomus
Maxilla1,palpslightlynarrowingdistally. Maxilliped, but differs mainly in its smaller size, normally un-
inner plate apically oblique, outer plate little broad- produced epistome, and other character states of the
ened, withlongapical pectinate setae;palpsegment3 key(p. 31).
short, length ~ 1/2segment2. The small subadult female from Lulu I.,has mark-
Coxae2-4,lowermarginswith8-10mainlylongish edly unequal rami ofuropod3, andlong coxal setae.
setae. Gnathopod 1 very stout, distinctly larger than Although the small specimenfrom Leadbetter Pt.
gnathopod2;dactyls withshortunguis. Gnathopod 1, wasnotdissected,itexhibitssomecharacteristicsofA.
palmaranglewithinnerandoutersubmarginairowsof slattery/,includingasmallmid-dorsaltoothonurosome
6-7and3-4simple spines respectively. Gnathopod2, 2,andrelativelylargeandpowerful gnathopods. The
palmar angle with inner submarginal rows of4and 2 innerramusofuropod3 is relatively short and thin.
&
short simple spines respectively. Peraeopods 3 4,
segment6straight, longerthan segment5. Coxae3- Anisogammarusepistomus, n. sp.
4 distinctly anterolobate. Peraeopods 5-7, bases dis- (Figs. 4,4A)
tinctlyheteropodous;peraeopod6slightlythelongest.
Peraeopods 6 & 7, basis with slight postero-distal Anisogammarus sp. 2, Austin, 1985: 607.
marginalexcavation. Coxal gillonperaeopod7large,
aboutequal in size tothatofperaeopod 6. MaterialExamined.
Epimeral plate3 hindcomersquared. Urosome 1, BRITISHCOLUMBIA:
mid-dorsal humpve,ry low, with 1-2 small spines and Southern VancouverI.,ELBStns.
weak lateral clusters of2 spines. Urosome 2 with 1955:
P6a, Long Beach, SE end Wickaninnish Bay, under algal
small median tooth, posterodorsal cusps lacking.
debrisonsand,LW,Aug.2 -C? (13.0mm),Allotype, (slide
Urosome 3 with single mid-d&orsal and dorsolateral mount),CMNC2001-0010;1<S subadult (10.0mm), Para-
medium spines. Uropods 1 2, rami shorter than type, CMNC 2001-0011.
peduncles, outer ramus of uropod 2 lacking marginal
1970:
spines. Uropod3,outerramus short,medium broad, P710b,CapeBeale(48°47.2'N, 125°13'W), sand,algae,and
LW
marginsspinose;terminalsegmentdistinct;innerramus bedrock, level,July 19 - 9ov. (13.0mm), Holotype,
short,~1/2outerramus,innermarginwithfewplumose (slidemount). Fig'dtypespecimen,andslidemount,could
CMN
setae. notbe located in collectionsattimeofwriting).
AMPHIPACIFICA VOL. 3 NO. 1. MAY 16, 2001 37
Fig. 3. Anisogammarus slatteryi, n. sp. Male (8.0 mm), Holotype; 9 ov (6.5 mm), Allotype.
Pachena Bay, Vancouver I, B.C.
AMPHIPACIFICA VOL. 3 NO. 1. MAY 16, 2001 38
Fig. 4.Anisogammarus epistomus n. sp. $ ov (13 mm), Holotype. Cape Beale, Vancouver I., B.C.